A nurse is reviewing arterial blood gas (ABG) results for a patient with chronic obstructive pulmonary disease (COPD). The results show: pH 7.32, PaCO2 55 mmHg, HCO3 28 mEq/L, PaO2 58 mmHg. How should the nurse interpret these findings?
- Respiratory acidosis with partial compensation
- Metabolic acidosis with partial compensation
- Respiratory alkalosis with full compensation
- Combined respiratory and metabolic acidosis